Water softener



FIG. 1 is a front perspective view of a water softener showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The broken lines show a display or control panel for illustrative purposes only, and form no part of the claimed design. 

The ornamental design for a water softener, as shown and described. 